A practitioner is a qualified person working in a health profession, from doctors and dietitians to nurses, pharmacists, and regulated therapists. The term is deliberately broad, covering anyone whose training and registration authorise them to assess, advise, or treat patients, and it appears throughout healthcare regulation, insurance, and professional standards. In nutrition, the distinction between practitioners with recognised qualifications and unregulated advisors matters enormously: registered dietitians, registered nutritionists, and medical practitioners work within codes of conduct, evidence-based practice, and accountability structures, while self-styled practitioners may not. Consumers seeking nutrition advice should verify credentials: protected titles, accredited degrees, and membership of professional bodies signal that a practitioner is answerable to standards beyond their own marketing. The word itself guarantees nothing; the qualification behind it guarantees everything.